Content for  TS 23.288  Word version:  19.1.0

Clause 6.23 describes how NWDAF can provide predictions of QoS and policy assistance analytics, based on the consumer request. The consumer can either subscribe to analytics notifications (i.e. a Subscribe-Notify model) or request a single notification (i.e. using a Request-Response model). The service consumer may be a PCF. The QoS and policy assistance analytic provides predictions of the QoE associated to a set of QoS parameters. When the service consumer needs assistance information to determine QoS or policy, it may send an Analytics request or subscription to NWDAF with one or multiple sets of QoS parameters and optional a requested QoE. NWDAF provides the candidate set(s) of QoS parameters and the corresponding derived predicted QoE that is expected to be achieved by applying the candidate set(s) of QoS parameters (the candidate set(s) of QoS parameters are within the sets of QoS provided by the consumer (i.e. PCF)). The NWDAF shall include only the parameter(s) and the corresponding value(s) that are provided in the consumer request (i.e. PCF) in the output QoS parameter set(s). The QoS and policy assistance analytic may be provided for individual UE or group of UEs (e.g. the QoE is for the application ID(s) associated to one or more QoS flow(s) of the UE(s)), or for an application (e.g. the QoE is for the service flow of the application ID). The consumer of these analytics indicates the following information in the request or subscription:

• Analytics ID = " QoS and Policy Assistance".
• Target of Analytics Reporting as defined in clause 6.1.3.
• A list of one or more QoS parameter set(s) and optionally each associated with a QoS parameter set ID. Based on PCF decision, the QoS parameter set(s) include one or a list of the following individual parameters and non-empty value list(s) for individual parameter(s) in every QoS parameter set(s):
  • 5QI (standardized or pre-configured) or QoS Characteristics attributes (as defined in clause 5.7.3 of TS 23.501): Resource Type, Priority Level, PDB, PER, Averaging Window, Maximum Data Burst Volume;
  • For GBR flows: GFBR and MFBR.
• Optionally, a requested QoE to indicate NWDAF to only provide the QoS parameter set(s) and their corresponding value(s) for which the predicted QoE is equal or higher than the requested QoE.
• Analytics Filter Information optionally includes:
  • DNN;
  • Application ID or SDF template;
  • Area of Interest (AOI(s));
  • S-NSSAI and NSI ID;
  • List of analytics subsets that are requested, (see clause 6.23.3), e.g. parameter(s) in QoS parameter set(s).
• An Analytics target period indicates the time period over which the analytics are requested.
• In a subscription, the Notification Correlation Id and the Notification Target Address are included.
• Preferred order of results for the list of candidate QoS parameter sets and the predicted QoE associated to the candidate QoS parameter sets:
  • ordering criterion: "QoE" (i.e. QoE that is associated to candidate QoS parameter set) or "usage duration" or "number of usages" of a QoS flow,
  • order: ascending or descending.
• Reporting Thresholds, which apply only for subscriptions and indicate conditions on the levels to be reached for the respective analytics subsets (see clause 6.23.3).
• Maximum number of objects and maximum number of SUPIs.
• Preferred granularity of location information: TA level or cell level or "longitude and latitude level".

The NWDAF supporting QoS and policy assistance analytics shall be able to collect information from AF, OAM and 5GC NFs. The following specified input data might be reused by QoS and policy assistance analytics:

• The input data defined for Observed Service Experience related network data analytics as defined in clause 6.4.2, e.g. the information of the application, Service Experience and QoE metrics.

In addition, more information collected by the NWDAF from relevant 5GC NFs (i.e. UPF, SMF, AMF, PCF) is defined in Table 6.23.2-1.

The NWDAF shall be able to provide prediction on QoS and Policy Assistance to consumer NFs, i.e. PCF, as defined in Table 6.23.3-1.

Figure 6.23.4-1 shows the procedure for the NWDAF to derive and provide the QoS and policy assistance analytics to a consumer 5GC NF (i.e. PCF).